The dehydrogenation of certain hydroaromatic hydrocarbons on a chromate catalyst
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Investigation has been made of the dehydrogenation of cyclohexane, decalin, methylcyclohexane, 1,3-dimethylcyclohexane, tetralin and 2-methyl-5, 6, 7, 8-tetrahydtonaphthalene on a chromate catalyst. This is the first time that such a study has been carried out on the last four of these compounds. Energies of activation were determined for the dehydrogenation of cyclohexane, 1,3-dimethylcyclohexane, methylcyclohexane, tetralin and methyltetralin on chromic oxide.
The structurally closely related hydrocarbons cyclohexane, methylcyclohexane, dimethylcyclohexane, and decalin, are characterized by Arrhenius constants which are approximately the same, but not identical, in value. The appearance of the methyl groups in the cyclohexane ring somewhat diminishes the values of these constants, this, in turn, leading to marked differences in the rates of dehydrogenation at high temperatures.
Tetralin and methyltetralin are capable of being dehydrogenated on a larger number of active sectors than is the case with cyclohexane and its homologs, the dehydrogenation being characterized by higher values of the Arrhenius constants.
For the dehydrogenation of each of these hydrocarbons, the multiplying factor is logarithmically related to the energy of activation. The dispersion constant is the same in all cases.
KeywordsOxide Methyl Chromate Hydrocarbon Cyclohexane
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